Powerwave Technologies 5JS0046 Hurricane, Model NTGY81AA User Manual 5

Powerwave Technologies Inc Hurricane, Model NTGY81AA 5

sect 5

044-05079 Rev. A 5-1MAINTENANCE5-1. INTRODUCTIONThis section contains periodic maintenance and performance test procedures for the multichannelpower amplifier. It also contains a list of test equipment required to perform the identified tasks.NOTECheck your sales order and equipment warrantybefore attempting to service or repair the unit. Do notbreak the seals on equipment under warranty or thewarranty will be null and void. Do not returnequipment for warranty or repair service until propershipping instructions are received from the factory.5-2. PERIODIC MAINTENANCEPeriodic maintenance requirements are listed in Table 5-1. Table 5-1 also lists the intervals atwhich the tasks should be performed.Table 5-1. Periodic MaintenanceTASK INTERVAL ACTIONInspectionCables and Connectors 12 Months Inspect signal and power cables for frayedinsulation. Check RF connectors to besure that they are tight.Performance Tests 12 Months Perform annual test per paragraph 5-5.5-3. TEST EQUIPMENT REQUIRED FOR TESTTest equipment required to test the amplifier is listed in Table 5-2. Equivalent test equipment maybe substituted for any item, keeping in mind that a thermistor type power meter is required.NOTEAll RF test equipment must be calibrated to 0.05dB resolution. Any deviation from the nominalattenuation must be accounted for and factoredinto all output readings.Section5
044-05079 Rev. A 5-2Table 5-2. Test Equipment RequiredMENCLATURE MANUFACTURER MODELSignal Generator Agilent (H.P.) ESG4433B30 dB Attenuator, 250 Watt TenulineSpectrum Analyzer H.P. 8562ECoax Directional Coupler H.P. 778DPower Meter / Sensor H.P. 437B / 8481ANetwork Analyzer H.P. 8753DCurrent ProbeSource Diskette PowerwaveDriver PA (1930-1990 MHz) 12 dB gain, P1dB = 29 dBm (min)5-4. PERFORMANCE TESTPerformance testing should be conducted every 12 months to ensure that the amplifier systemmeets the operational specifications listed in table 5-3. Also verify system performance after anyamplifier module is replaced in the field. The test equipment required to perform the testing is listedin table 5-2, and the test setup is shown in figure 5-1.5-4.1. AMPLIFIER PERFORMANCE TEST.To perform the test, proceed as follows:1. Connect test equipment as shown in figure 5-1.NOTEDo not apply any RF signals at this time.AMPLIFIER SPURIOUS EMISSIONS TEST:2. Load the MFRM waveform on the ESG (signal generator). Apply this signal through a driveramplifier to the MCPA so that the RF signal going into the MCPA is approximately 0 dBm(adjust the input RF signal level to get 47 dBm output power). Measure spuriousemissions. Verify that it is within specification.GAIN TEST:3. Set input power level to power amplifier at 0 dBm (1932, 1960, and 1987 MHz).4. Measure the output power in dBm.5. Subtract input power (in dBm) from output power (in dBm) to get gain.6. Check the amplifier gain across the band from 1930 MHz to 1990 MHz. Gain should be 47 ±2 dB. Record test data in table 5-3.INPUT RETURN LOSS TEST:7. Read and record the S11 return loss measurement on network analyzer. Record test data intable 5-3.
044-05079 Rev. A 5-3Figure 5-1. NTGY81AA Amplifier Test Setup Diagram
044-05079 Rev. A 5-4Table 5-3. Multichannel Power Amplifier NTGY81AA Test Data SheetTested By: ___________________ Serial No: ________________Pass/Fail: ____________________ Date: ____________________50W MCPA TestTest Conditions: Load and source impedance: 50 ohms, VSWR < 1.2:1Supply voltage: +26 Vdc ±± 0.4 Vdc (unless otherwise noted).Network Analyzer Span: 60 MHzMarker #1 = 1930 MHz, #2 = 1960 MHz, #3 = 1990 MHzTEST CONDITION MIN MAX FREQUENCY (MHz)1.00 NETWORK ANALYZER 1930 1960 19901.01 Gain 45.0 dB 49.0 dB1.02 Gain Flatness 0 dB 0.4 dB/1.25 MHz1.03 Input Return Loss, worst case In band -10 dB1.04 Output Return Loss, worst case in band -15 dB2.00 CDMA TESTS (Spurious Emissions)3 TONE: W-CDMA @ 50W outRBW= 3KHz; VBW=10KHz2.01 ? @ +2.25 Mhz -16 dBm/1 MHz2.02 ? @ –2.25 Mhz -16 dBm/1 MHz2.03 2nd Harmonic 3860 3920 3980-16 dBm/1 MHz2.04 Pilot 1925 1945 196516 dBm/1 MHz2.05 Current @ 50 W out 19 A
044-05079 Rev. A 5-55-5. FIELD REPLACEMENT OF THE MODULEThe NTGY81AA multichannel power amplifier module can be replaced in the field on site by aqualified technician with experience maintaining RF power amplifiers and similar equipment.To replace a power amplifier module, proceed as follows:1. Turn off 26 Vdc power to that specific module.2. Disconnect the two RF cables and connectors P1 through P5.3. Remove 13 screws that secure amplifier module to heat sink.4. Carefully remove amplifier module from heat sink.5. Add Thermstrate thermal interface pad to surface of replacement amplifierwhich mates with heatsink.6. Install replacement in reverse order of steps 1 through 4 above.

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